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COMPOSiTiONS! COATING R PLASTIC.

UNITED STATES PATENT OFFICE.

ANDREW GLASSEL DICKINSON, OF NEW YORK, N. Y.

ARTlFlClAL STONE.

EPECIPICATION forming part of LetteISPatent No. 387,?44, dated August 7,1888.

Application filed June 1-2, 1858.

IO vention consists of a composition composed of ingredients specifiedand combined, as fully set forth hereinafter.

In preparing my composition I use cementas, for i nstancc, Portlandcementalkali,silica, crushed stone or gravel, and a coloring ma.- terialin connection wit-h a. solution of sulphuric acid, muriate ofsoda, andasolution of caoutchouc or rosin with glue and gallic acid. The cementismixed with asolution ofalkali as potash or pearl-ash-and sand or groundsilica is added. The crushed stone or gravel is washed with .weaksulphuric acid, and is then added to the cement mixture together with asmall portion of muriate of soda and any suitable coloring material.For-outside \rork asolution of caoutchouc in naphtha or other solvent isadded to the mixture; but for inside work a solution of rosin may beused instead of the caoutchouc, together with glue and gallic acid. Theproportions ofthese i11 gredients will vary according to the characterof the mixture and the purpose for which it is to be used.

In one preparation the proportions will be of artificial substitutes forstone; and my in- Serial No. 216,949. (No specimens.)

as follows: cement ten parts; and or silica. ten parts. ese are mixedtogether with a strong solution of alkali until the mixture is of aboutthe consistency of thin paste. The coloring-matter is then added,together with 0 the crushed stone, until the consistency of the mixtureis about that of ordinary mortar. When the material is to. be used, thesolution ofcaoutchoue and IOSlll and lue and "allic acid are added, theproportions ot the materlai 5 in the solution being such as will securethe strongest possible solution, and the amount of solution to theamount of the mixture varying according to circumstances, ten per cent.being sufficient for ordinary purposes. After the material is thusprepared it is cast into molds or applied to surfaces to be coated, orused as a filling for the hollow blocks of wood pavements, or for otherpurposes, as may be required.

Without limiting myself to theprecise proportions specified, I claim- Acomposition of matter to form an arti' ficial stone, consisting ofcement, alkali in solution, silica, crushed stone or gravel, muriate' 60of soda, caoutchonc or rosin, and glue-and gallic acid, substantially asset forth.

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

.isiinnw 'GLASSEL DICKINSON.

Witnesses:

I. SANCHEE, O. W. CONSBACHEB.

